There were no Francis's in Sir Cuthberts line and as far as I am aware they never lived in Newmarket he had as far as records show only one son Christopher, I have Christopher's line they moved to Banstead Surrey in the 16th century and remainedithere until 19/20th century there his current direct descendents live in Sussex England.
Cuthbert left Westmorland in the 1500's, its more than possible he had siblings and cousins there but his direct male line never emigrated to America. Buckles was name found in many Part of UK and had different origins